pillars/users/init.sls:

user1:
    fullname: George Example
    role: admin
    email: thisemail@example.com
    groups:
      - root

states/testate/init.sls:

{% for user, data in salt['pillar.get'] ('users').iteritems() %}

  {% if salt['pillar.get'] ('users:{{ user }}:role') == 'admin' %}
     {{ salt['pillar.get'] ('users:{{ user }}:email') }}
  {% endif %}

{% endfor %}